Process of making bronze



Patented June 30, I

UNITED STATES HENRY n. smrn, or BERWYN, rnnns'rnvnmn, Assrenon'pr ONE-HALF ronnnn n.

SMITH, or IBELRWYN, rn'nnsrnv' rnocnss or MAKING :Bnonzn.

No Drawing.

To all whom z't may concern:

Be it known that I, HENRY H. SMITH, a citizen of the United States, residing-at Berwyn, in the county of Chester and State of Pennsylvania, have invented certain new and useful Improvements in Processes of Making Bronze, of which the following is a specification.

The object of my invention is to' provide be 'more uniform in its physical properties and better adapted for bearingsiand to withstandpressure than the bronzes heretofore used, and the invention 4 consists in the hereinafter departs of boric acid are-placed on top of the molten copper and, after a minute or two,

the boric acid is stirred in, preferably with a green wood pole. The foundation metal, either in molten state or in the form of ingots, is added to the molten copper and fused therewith thus forming the bronze.

In making the second and subsequent heats, I prefer to fuse with the copper a part of the bronze produced by a previous .heat which part may constitute about one third of the total. In other words, in the second and subsequent heats'I'fuse 51 parts of foundation metal and about 17 8 parts of previously made bronze. with 306 parts of copper, 4 parts of boric acid being added as before. Addition of the previously made bronze does not change the proportions of the ingredients but, due to the remelting and recrystallization of the metal, does-produce abronze of better resisting properties.

The resulting product is a bronze of greater unlformity andfdensity than any heretofore. rod-need.

While I ave described my. invention as taking a particular form, itwill be understood that the various parts may be changed without departing from the spirit thereof, and hence I do not limit myselffto the a bronze of the non-granular type which will Application filed December 11, 1923. serial no. 680,039.

precise construction set; forth, but consider that I am at liberty to make such changes and alterations as fairlycome within the scopeof the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. A method of "making bronze which I consists in fusing approximately 40" partstin, 10 parts zinc and, 1 part phosphor copper to produce a foundation metal, fusing approxlmately 306parts copper, raising the temperature ofthe copper to approxi-. mately 2200 degrees and fusing the foundation metal with theco er. 2. Amethod of making bronze which consists in fusing tin, zinc'and phosphor copper to produce a'foundation metal, fusing cop-- .per, adding boric acid tothe copper and fusing the foundation metal with the copper.

3. method of making bronze which consists'in fusing tin, zinc and phosphor copper to produce afoundation metal, fusing cop per, raising the temperature of the copper to approximately 2200 degrees,'adding boric acid to the copper and fusing the foundat'ion metal with the copper.-

4. A method of making bronze which consists in fusing approximately 40 parts tin, 10 parts zinc and 1 part phosphor copper to produce a foundation metal,fusing 31p? proximately 306 parts, copper, adding approximately 4 parts boric acid and fusing the foundation metal with the copper.

5. A method of making bronze which consists in fusing approximately 40 parts tin,

10 parts zinc and 1 part phosphor copper to produce a foundation metal, fusing ap proximately 306 parts copper, raising the temperature of the copper to approximately 2200 degrees, adding approximately 4 parts boric acid and fusing the foundatlon metal with the copper.- 7

6. A method ofmaking bronze which con sists in fusing tin, zincv and phosphor. copper to produce a foundationmetal, fusing cop-' portion of previously made bronze with the copper.

7. A method of making bronze which con- .sists in fusing tin, zinc and phosphor copper to produce afoundation metal, fusing copper, adding boric acid to'the' copper, and fusing the foundation metal and, a portion of previously made bronze with the c gpper,

per, and fusing the foundation metal and a l 8. A method of making bronze which consists in fusing approximately 40 parts tin, 101381175 zinc and 1 part phosphor copper to produce a foundation metal, fusing approximately 306 parts copper and fusing the foundation .metal and approximately 178 parts of previously made bronze with the copper.

9. A method of making bronze which consists in fusing approximately 40 parts tin,

10 parts zinc and 1 part phosphor copper to produce a foundation metal, fusing approximately 306 parts copper, adding approximately 4 parts of boric acid tothe molten copper, and fusin the foundation metal and approximately 1 8% parts of previously made bronze with the copper.

In testimony whereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

HENRY H. SMITH. Witnesses MARY M. NORRIS, WANE MORAN. 

